code: def test_cross_validation(self):
      testargs = """
          examples/by_feature/cross_validation.py
          --num_folds 2
          """.split()
      with mock.patch.dict(
          os.environ, {"TESTING_MOCKED_DATALOADERS": "0"}
      ):
          output = run_command(
              self._launch_args + testargs, return_stdout=True
          )
          results = re.findall("({.+})", output)
          results = [r for r in results if "accuracy" in r][-1]
          results = ast.literal_eval(results)
          self.assertGreaterEqual(results["accuracy"], 0.75)
  
imports: import ast
  import os
  import re
  import shutil
  import tempfile
  import unittest
  from unittest import mock
  import torch
  from accelerate.test_utils.examples import compare_against_test
  from accelerate.test_utils.testing import TempDirTestCase, require_trackers, run_command, slow
  from accelerate.utils import write_basic_config
label_desc: Use image node_id 7 for calling the FeatureExamplesTests obj's underlying member method code with example usage: obj.test_cross_validation() without return types